HT66F302 datasheet(90/129 Pages) HOLTEK

90 / 129 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

Capture Input Mode

ToselectthismodebitsPTM1andPTM0inthePTMC1registershouldbesetto01respectively.

Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter

andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignal

issuppliedonthePTPIorPTCKpin,selectedbythePTCKSbitinthePTMC1register.Theinput

pinactiveedgecanbeeitherarisingedge,afallingedgeorbothrisingandfallingedges;theactive

edgetransitiontypeisselectedusingthePTIO1andPTIO0bitsinthePTMC1register.Thecounter

isstartedwhenthePTONbitchangesfromlowtohighwhichisinitiatedusingtheapplication

program.

WhentherequirededgetransitionappearsonthePTPIorPTCKpinthepresentvalueinthecounter

willbelatchedintotheCCRAregisterandaTMinterruptgenerated.Irrespectiveofwhatevents

occuronthePTPIorPTCKpinthecounterwillcontinuetofreerununtilthePTONbitchanges

fromhightolow.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero;inthis

waytheCCRPvaluecanbeusedtocontrolthemaximumcountervalue.WhenaCCRPcompare

matchoccursfromComparatorP,aTMinterruptwillalsobegenerated.Countingthenumberof

overflowinterruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.

ThePTIO1andPTIO0bitscanselecttheactivetriggeredgeonthePTPIorPTCKpintobearising

edge,fallingedgeorbothedgetypes.IfthePTIO1andPTIO0bitsarebothsethigh,thennocapture

operationwilltakeplaceirrespectiveofwhathappensonthePTPIorPTCKpin,howeveritmustbe

notedthatthecounterwillcontinuetorun.

AsthePTPIorPTCKpinispinsharedwithotherfunctions,caremustbetakenifthePTMisinthe

CaptureInputMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispin

maycauseaninputcaptureoperationtobeexecuted.ThePTCCLR,PTOCandPTPOLbitsarenot

usedinthisMode.

HT66F302 Datasheet(PDF) 90 Page - Holtek Semiconductor Inc